Greenwood Reservoir Report

Last Updated: December 5, 2025

Greenwood, located in Cedaredge, Colorado, is a privately owned irrigation dam constructed in 1958 on the Surface Creek-TR river system.


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Summary

With a structural height of 27 feet and a hydraulic height of 23 feet, this earth dam serves the primary purpose of irrigation, providing essential water resources to the surrounding area. The dam has a storage capacity of 255 acre-feet and covers a surface area of 15 acres, supporting agricultural activities in the region.

Despite being classified as having a low hazard potential and assessed as in fair condition as of October 2017, Greenwood poses a high risk due to its location and the potential impact of failure. The dam is subject to regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulations. With a maximum discharge capacity of 642 cubic feet per second and outlet gates consisting of slide and uncontrolled mechanisms, Greenwood plays a crucial role in managing water resources in the area.

Overall, Greenwood represents a vital infrastructure for water management in the region, supporting irrigation activities and ensuring a stable water supply for agricultural purposes. As a state-regulated dam with a history of compliance and maintenance, Greenwood stands as a testament to the importance of responsible water resource management in the face of climate challenges and evolving regulatory requirements.

Year Completed

1958

Dam Length

1365

Dam Height

22

River Or Stream

SURFACE CREEK-TR

Primary Dam Type

Earth

Surface Area

15

Hydraulic Height

23

Nid Storage

255

Structural Height

27

Outlet Gates

Slide (sluice gate), Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.